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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa793ac730d909977ecb2c2182b16cf5bd4b31bdc7406c21d665c475b6175a5b' 
  AND token = 'HyMeDU/wxWEGh3sdHZ81QUJxGoGuNMDyItpm9WB2zkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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