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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b18b5295457e76b3cbef2c6cbb67be47f549b00aa96e567d95fa1e8a45e94e' 
  AND token = 'J9xjkaqzqpmF/Ck2t244gwgjo1BOOJvoPlAvKQDBxA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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