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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f47560d3faa66013bd1212c81f24cb5e4473a23f310da742156ab04a9644518' 
  AND token = '1CHDS90fn94nr/uHGOAJVARYatb39ard7T+Qm21wJAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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