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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62800ed05e2105bc8982fe9fda1a6f6ddffbe63cbd17484aa3d7d65944b43eb3' 
  AND token = '4jTN3EUvS9lf42jJ8Gq05qiKS6YxnZNnrSF1kj8UofY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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