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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca4c13d5ad05d24afe87aef0937598aedd1f53bad792b1e6fe2dbc863616e56' 
  AND token = '3j40CPRLiwTsk6xXt8tjI74lQOriaA0JLT8pFxBT7Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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