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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e2c9cf600c7d90680d92b168d7990289897408bf044e98ad6dc18c4f03ba65' 
  AND token = 'BFTUGkOqOSwev60tniianGn1SW3yxAdKz3iPwcMAL64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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