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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b31ba86d13333c4727d1b6b427912b7eba13f1c81b8e8bfb3dab4854fcb09a' 
  AND token = 'vbu27qqGpUPd8CU2Rc+U8LawWWF+Gi6SmiQU1WaETyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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