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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e974d116c1328c22fa99c9bfd267d575c4df1134f74bb2c21e34e4d433e534' 
  AND token = 'WWmu3p2G5QYc8GrOz5DQiyOUcoXAcbMajuCenQR8RtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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