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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d3d059869e7aa98fbbcae751d2b36d5fb638257a27bb9b0015a309213ffd64' 
  AND token = 'q2Y5PVDVu4ykPZNSr1B98EJlhrIE3irt7UF06I4mHbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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