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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f97445c1c1aea5ea47e19cbcacf141b3c33aeeb045947100991df6a73a56c0' 
  AND token = 'kZOAwdsfgQwCK3Y8pmMR6o428jY7AJwEgJsN0XYWmv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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