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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99316e932bd83b8362acf349b1001a1a4d0b30f752e22166936894b9bd5d77cf' 
  AND token = 'NfhezQ3HTcgG70BoHadg+E0cte1HzdHLZRwcbUVzjdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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