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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a312a244bc2936f5d9abb3429261a394308d0ac29febf9622150c98a85de2286' 
  AND token = '2sBXfq9z7PIA75ftBIHmZ6Kpxnw6tb6lcJGK27yNO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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