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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d075520c275ecfc36ec362e38c94e802d37f3672ef75c1ab83e64df0688cc1' 
  AND token = 'faHn/0rDYO9U5eHFyHgEsifePuXRvFsSW9Gg6WgzWLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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