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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dd16b30ea4036fdf17719f5fd1545cf6f3afde35a710670b9ddadde9d34520' 
  AND token = 'r3Or2nX2SHnZIwXkXzwG+5c6PSXvvQ3kwft1b4ZBYQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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