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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc96962c0cabb37b60c05fd7fedc90eba97a6f863364504bd93d8493fc6003cd' 
  AND token = '1TEcwqEeXHgSxoMyWJze0FwgfyZhmhH1b2Ytcc2QUWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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