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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481cbb437ad5ac49de758e9956f90ce12e9d4a95cd71fcd9f6c045077fbcba5b' 
  AND token = '1CrQK8FcAtj3bKvWHD2Bqo/52PwwGG4qXCTX5iB5UY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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