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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a2f66f4318ee5998fc74ed8a4aa831f95ec9e54545a1cf9847df0c75e94b25' 
  AND token = 'qaqYZ97drI7UDt6ipvZysEoMNFNiljhzO9SJGV6r4fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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