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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce502024829562442bbf3e2d76f57c2e93f2aa8f10674d5b84972dc82f192b9' 
  AND token = 'gkkLvSJ11i1y5mCF4fRTJkGMVpymvOkEkraXTYSErxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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