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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9b796075c21c00d5e5ba34148b3681d110efa6e320aec632aafeb6e5dc933e' 
  AND token = 'M6bOGypBjrKHiBHbzslDc7/NGDMvodTbIipn8CxP10I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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