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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e64ccc7d6c4c5a5eb415645afb4d32e82c5c48b9b581c19af5e7fad8c5bba9' 
  AND token = 'pJHYLtfKJFkMcIHifYfeWFcPWnhG2KWRsDu2J54JYk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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