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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1691f30f32f8acada22181895d87f19e92a5edefc2b142395ca7d3dde77ea9d' 
  AND token = 'IQTrODfYb6i4BeTogcAIA49mkcZtyBPGnis3GocZwII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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