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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ffaf0f244830f25b3e9db5e60d657bd447094458f9d56d78dcf47fb4fa2448' 
  AND token = 'J0uu5eaisT6OErtLnRzYLQNs7iI2AB074ZI91siScPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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