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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546a52d495283eff7dd3bb11b4be82edddb95c4c112c5397f80948f448828ac7' 
  AND token = 'oGCDm3q+r0PZUSa3/mjRg2kjISArimg7F4jU+ve2bB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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