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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc97ad1065cc084f8cc2f8c2ae9d065730e1af2a815447ab844f62c161e96ff' 
  AND token = 'Ntu4V/X0H32A6J/+WKFG+1uNuLK2FdLvUbLuJ7dtwqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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