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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eabcf1ce7066a3be4c79d5054ba46ec545409779345fd433279cd05de79beaa' 
  AND token = 'ck+y7QELjkbKRBcE1gvw1By1Y+YQvHy+iNaX7Ib3x/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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