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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a224a41648c595e554f763a13421d382013eaba863e9b1bf78009b523486ef5' 
  AND token = 'vzU4H4YeN/l2a9gbboY0HlXSJZGkPw9cql0Utc5Tjjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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