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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7118c9f1af064c415d321094e71f903ea81206a7f8f105110f2581e2feb6ef2' 
  AND token = 'AbJFkLCqTFTV657q2zw/VITXhEAzeeU6VNRTPavS5Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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