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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6511a5edade2581b2d1faaeaaeb8f6df47cc4474ab4a0c5b380b2d21b94ca6' 
  AND token = 'feQS95pUsCMYZ6fCSCYJG7uY9ycTOPFWPQEY/am9aB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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