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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34db89afa2bd3112cf8bea00c39581466ba1e097ab2be1e1a501a7b6b8eaa45d' 
  AND token = 'o1lgTz1ArUVRGtD5G8Vm6g2I0rD7LFTkfXsJlqAq1RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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