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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229872b171fcc95c668788d65ea8fbdd2ae35f57c3b534ab2ecc5631e785c97c' 
  AND token = 'orov67/coNyFCn26og04chcyb2mm3tHLup7QwxQL7BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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