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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910eab879c4aa45e5fa1dad96060542721c95eba61840224810f39b078f3bce7' 
  AND token = '4XklMdh2+qmiHg4Qr+nPoL9jTF8mh+51BJo++8d/keQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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