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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131f725a8cb94ac2a2deb499a1f1918e81f889b421903ac613d7837915c27037' 
  AND token = 'RLIpqTOSJKXchzpN1iKaun+MpimO6Hw+LG2Kygzr6+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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