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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5473278c8b8a3b06477ec335b1519169e996262768f7202b6837ec2bb53503c4' 
  AND token = '4o0JKaZQtRjBdt6/GeKMm9kTY9NoKBP4JeYn4stpahY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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