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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9638ff301e41f4b73d682fe0b6b9992fd3d58a72a127f775bd40e647990be00f' 
  AND token = 'D5Jw5sN3GcvQyqvurtgbo7mhxkDgScfMXO+/DSn6ki8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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