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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f166b3934f076943a93b52ac22cd6969e8fa99fbbdafafb3a4867d82999797a1' 
  AND token = 'fniWfT+/28CQg64zxA8TcU3BiUz0wYWBX94I09xH3Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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