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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e7bbab1cd436c0b1e69d9f08ea818cde22926c011360e1032fec5615cb264b' 
  AND token = 'N0OwMNSntWVDbgTKKTRsiq6ZXO6bJSPGZhm/MLAGlKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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