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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718abb888993bf69098408c5e8957eccdf34bcc456bf2646c0cf98c70aa328b5' 
  AND token = 'Jva4WKdq41fKgsQ5CrMaq/wVP8tXt7yM8NMOLBAoZs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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