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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8dbf2a0f2c45e2fb66216caa4a9eb5f12e3a6e2f6881e352812d8574ab182f' 
  AND token = 'hLygyivJRJE3WQtVd8lvSVW2QenBDKlQTOGUii6kMz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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