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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b032c69d9afb12e8d48602cda214abc28bb035ecc68c2a857336b8fbdf296134' 
  AND token = 'XjZ4cqjP5KIphvClhXW2bLA5t+mAX0c7Qmt4iJRqMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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