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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd59d93b218d16a9abb2a60c5dcdb94e8a60fc7e7af4afc7b4ef0e040e303aa' 
  AND token = 'jsRvbXKrKBnCHfoGa6v7YavQre/fVmMiXTwDzw8Xbfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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