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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71564c6d2bdd88d98068202e13d21882edb57c2877cb4dad86c37db7356e90de' 
  AND token = 'sz1ySTn/sOdCTCP25m6ocR5rE/ATOiae6r+D+znozDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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