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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac34d6d5487e40603378b63214a9f9054c1c9e340a0fd1114e8100de285cfba' 
  AND token = 'cy5Vw+WYNO1iN/qJYShQ0M3QNIOhYgZe2nJbIMMfAyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}