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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac79a8e8a570a72c69b4e988a9c5a92f1bbd4da8df18f66c586a353453006bd' 
  AND token = 'wGw9XrJjkhsRFBFIBG2gtt9PzQzB2XtG0Qb9TbTQ6UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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