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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905a58ac73fcf8520f08523c8c636c70246d6a4b4106eeb77db5344eb603e467' 
  AND token = '3sJYxI8/ig5HAIR5KvUdtABbfBoKIrriCD+KJlWni3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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