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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce34eb725583069f7e3d2a161601b9e5e2f066e8473c89a46d22e35c2cb6ee9' 
  AND token = 'fcO+zD8NDk4ZN7l1wq/wQvzgP+6z09Ep3sDH2Nn+ySM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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