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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ace919eb9c35758dec6008281f20cbf8d27f7e24ccce6316d48b78cc4d70318' 
  AND token = '9RK9zxHgQrEQp9l2esNDmlk5iKm0c/3BX1hmigKDr7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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