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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee96852c7de3ec71de256f36cc9048d410929377dadff79de6188582b44dbb5' 
  AND token = 'QWMErrkuWMqAh14EewRXY7OnauJqj+NiYA4T3/NifwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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