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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f84c31de0572c826ff95388c7b9a79f5c23a84efa5960499de983e80842d6ea' 
  AND token = 'fPvS4bGWK6WfE4gXggGiJr5dCRSLWIZtRrdJGlLzpX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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