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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1caf2af380b0d9b6e63c9cfa303472d985607c347722f4f3decc6a96db3a2c7' 
  AND token = '4VJ38rvoOWG4rxiyU2qibuLs+6hGmy6Nzzzk0jaCNoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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